Show that the following sentence is a contradiction by constructing a derivation without premises that shows its *opposite* to be a logical truth. you may use any of our derivation rules (including the derived rules most recently covered). a≡~a

step-by-step explanation:

subtract 7, so the answer is x < = 3, or c.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

c

step-by-step explanation:

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify